Method of Making a Cathode from Tungsten and Iridium Powders Using a Strontium Peroxide Containing Material as the Impregnant.
Patent Application, Filed 25 Nov 88,
DEPARTMENT OF THE ARMY WASHINGTON DC
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This invention relates in general to a method of making a long long life high current density cathode and in particular, to a method of making such a cathode from a mixture of tungsten and iridium powders using a strontium peroxide containing material as the impregnant. The general object of this invention is to provide an improved method of making a long life high current density cathode. A more specific object of the invention is to provide such a method in which lower temperatures can be used than were used in S.N. 204, 327 for the impregnation of the tungsten-iridium billet. It has now been found that the aforementioned objects can be attained by a method that uses a strontium peroxide containing material as the impregnant. More particularly, according to the invention, a suitable porous billet of tungsten, or tungsten-iridium, or tungsten-osmium or tungsten-rhodium is impregnated with a strontium peroxide containing material in a hydrogen atmosphere and slowly heated to above 215 C to decompose the strontium peroxide, SrO2 to form strontium oxide, SrO, and oxygen, O2. Patent applications. JES
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